#4 – George Dantzig

American mathematician George Dantzig, as a graduate student of the University, once late for a lesson and accepted written on a blackboard equation as a homework. It seemed to him harder than usual, but after a few days he was able to carry it out. It turned out that he decided two "unsolvable" problems in the statistics, which many scientists could not solve.

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#3 – Roulette

#2 – Sofia Kovalevskaya

Sofia Kovalevskaya met with mathematics at an early age, when it turned out that there was not enough wallpaper for her room, so sheets with lectures on differential and integral calculus after Ostrogradsky were put up on the walls.